Tyre Pressure advise pls for newish owner

[G20RG B]

Hi Guys
Had my Cerb now for a few weeks, awsome machine really enjoying it. Could someone pls advise what tyre pressures you are running.

18" Spiders 255 35 rear
18" spiders 235 35 front

2003 Model SP6

[Tanguero]

G20RG B said:

Hi Guys
Had my Cerb now for a few weeks, awsome machine really enjoying it. Could someone pls advise what tyre pressures you are running.

18" Spiders 255 35 rear
18" spiders 235 35 front

2003 Model SP6

On those sizes for day to day running I used 24psi all round. For sprinting I droped it down a bit to 22 ish and for drag racing I would drop the back only to 14.

If you want to be sure, get hold of an IR thermometer. Take the car for a run to warm the tyres up, then measure the temperature in the middle of the tread and at the edges. If it is hotter in the middle then it is over inflated, if it is hotter at the shoulders then it is under inflated.

[gruffalo]

Owners manual says 22 fron and 24 rear for road or 25 and 28 when "high speed continental driving or fully loaded with luggage" and 28 all round for track work.

I like the bit about "continental touring";-)

[touching cloth]

35 way high for Cerbs as it's a comparatively light car, I run 25 all round and know a lot of people run lower still.

[Gazzab]

touching cloth said:

35 way high for Cerbs as it's a comparatively light car, I run 25 all round and know a lot of people run lower still.

Think that 35 is his tyre wall rather than tyre pressure !!

[touching cloth]

Doh, time for bed - ignore me

[G20RG B]

Gazzab said:

touching cloth said:

35 way high for Cerbs as it's a comparatively light car, I run 25 all round and know a lot of people run lower still.

Think that 35 is his tyre wall rather than tyre pressure !!

yea 35 is the tyre wall,

night,night TC

thanks for the reply guys.

[Allandwf]

I ran my SO3's at 24,but when replaced the inner edges showed stress markes, caused by under inflation according to the garage. I am now on Goodyear F1's and running them at 28psi. ( On spiders 255 35 18, and 225 35 18.)

[ridds]

22 front 24 rear for mine.

Any more in the front and it tramlines badly.

Pressures do seem very low for a 1200-1300kg car but seems to work ok.

[Allandwf]

Hmmmmm.... Mine tramlines badly on 28, I'll reduce them and see how it goes, seems to be a juggling act between driveability/traction and tyre wear.

[dirty boy]

Tanguero said:

G20RG B said:

Hi Guys
Had my Cerb now for a few weeks, awsome machine really enjoying it. Could someone pls advise what tyre pressures you are running.

18" Spiders 255 35 rear
18" spiders 235 35 front

2003 Model SP6

On those sizes for day to day running I used 24psi all round. For sprinting I droped it down a bit to 22 ish and for drag racing I would drop the back only to 14.

If you want to be sure, get hold of an IR thermometer. Take the car for a run to warm the tyres up, then measure the temperature in the middle of the tread and at the edges. If it is hotter in the middle then it is over inflated, if it is hotter at the shoulders then it is under inflated.

You learn something simple and new every day

[JensenA]

dirty boy said:

Tanguero said:

G20RG B said:

Hi Guys
Had my Cerb now for a few weeks, awsome machine really enjoying it. Could someone pls advise what tyre pressures you are running.

18" Spiders 255 35 rear
18" spiders 235 35 front

2003 Model SP6

On those sizes for day to day running I used 24psi all round. For sprinting I droped it down a bit to 22 ish and for drag racing I would drop the back only to 14.

If you want to be sure, get hold of an IR thermometer. Take the car for a run to warm the tyres up, then measure the temperature in the middle of the tread and at the edges. If it is hotter in the middle then it is over inflated, if it is hotter at the shoulders then it is under inflated.

You learn something simple and new every day

Exactly what I was thinking

[touching cloth]

Heard of a similar concept with chalk, mark heavy chalk line over the tyre and take it for a bit of a drive. Check line after, if wiped off completely in the middle but not edges then it's over, gone on edges but still in middle then under - even wear being about bang on. Same principle as the temp and useful if no infrared thermo thingy, can't say I have ever tried it to see if it works, suspect I would end up driving 50 miles and have no chalk left at all

[Tanguero]

See below for a better one!

A very handy addition to the tool box.

Edited by Tanguero on Wednesday 21st October 11:47

[touching cloth]

Tanguero said:

I see that Maplins has them on special offer £29.99 (£20 off list) at the moment
http://www.maplin.co.uk/Module.aspx?ModuleNo=34092...

A very handy addition to the tool box.

Pretty poor temp range though, think the £50 one go way way higher - good range means can use to check brake disc temp/manifolds etc

This one looks the daddy,

http://www.maplin.co.uk/Module.aspx?ModuleNo=22104...

might have to go on my Chrimbo list so I can pretend to be all manly and give the illusion of hardened track warrior at track days

[Tanguero]

Yep - I should have read the range... the one I posted is crap! I assumed it was the other one.

[Byker28i]

Allandwf said:

I ran my SO3's at 24,but when replaced the inner edges showed stress markes, caused by under inflation according to the garage. I am now on Goodyear F1's and running them at 28psi. ( On spiders 255 35 18, and 225 35 18.)

Seems high. I'm running 24 all around on 17" wheels Eagle F1's

[dirty boy]

touching cloth said:

might have to go on my Chrimbo list so I can pretend to be all manly and give the illusion of hardened track warrior at track days

And then give the game away when spotted being chased by TDis and Saxos

[markh1]

touching cloth said:

Tanguero said:

I see that Maplins has them on special offer £29.99 (£20 off list) at the moment
http://www.maplin.co.uk/Module.aspx?ModuleNo=34092...

A very handy addition to the tool box.

Pretty poor temp range though, think the £50 one go way way higher - good range means can use to check brake disc temp/manifolds etc

This one looks the daddy,

http://www.maplin.co.uk/Module.aspx?ModuleNo=22104...

might have to go on my Chrimbo list so I can pretend to be all manly and give the illusion of hardened track warrior at track days

Ooh that looks good! More clutter for the garage!

[touching cloth]

It won me over at the reference to "Dual Laser Targeting"